摘要
通过原位自由基聚合方法制备了聚甲基丙烯酸甲酯(PMMA)以及含镓(Ga)质量分数为11.3%和13.5%的PMMA/Ga纳米复合材料.在玻璃化转变温度及以上温区,利用能量耗散技术研究PMMA/Ga纳米复合物的动力学弛豫行为,发现随着Ga含量的增加,复合物的α弛豫峰移向高温但峰高降低.此外,还定量研究了Ga含量对PMMA/Ga复合物的α′弛豫的影响,并作出了相应的解释.
Two kinds of poly（methyl methacrylate） /gallium （ PMMA /Ga） nanocomposites with different Ga contents （11. 3% and 13. 5% ） were prepared by free radical polymerization. The relaxation dynamics of PMMA /Ga nanocomposite above the glass transition temperature has been investigated by mechanical spectroscopy. It was found that the peak temperatures of α relaxation of the nanocomposites increase with the increasing Ga content,but the peak heights of α relaxation decrease. Besides,the composition-dependent dynamics of the α′ relaxation in PMMA /Ga nanocomposites was also studied.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期414-420,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:50803066,10874182和10674135)资助的课题~~
关键词
相对能量耗散
玻璃化转变
力学弛豫
relative energy dissipation
glass transition
mechanical relaxation
